The mod on the left is a thin strip of metal (~.010" thick) that is
split lengthwise, soldered to the flat metal shield above and the other half is
soldered to the coax shield. It is attached to the casting with a small
screw. The mod on the right is soldered to the coax shield and you can see
the head of the tiny screw fastened to the casting. The screw is a much
better long term solution than adhesive copper tape which tends to lose
conductivity over time.